SmogRank / History / May 31, 2023

Most polluted cities on May 31, 2023

1,310 cities ranked by their average PM2.5 over the day; the worst was Manama, Bahrain, at 134.0 µg/m³. Each city's own local calendar day.

Bad-air episodes during May 31, 2023. All episodes.

← Manama 134.0 µg/m³ 100 µg/m³15 WHO 24-hour guideline
Every city ranked for May 31, 2023, one column each, worst on the left and cleanest on the right; height is PM2.5 in µg/m³. Point at it to read a city; tap to open it.
  1. 1ManamaManama, Bahrain
    2098.9×
  2. 2CuricóMaule Region, Chile
    1846.9×
  3. 3Dhakalow-cost sensorsDhaka Division, Bangladesh
    1826.7×
  4. 4NacimientoBiobio, Chile
    1725.7×
  5. 5RancaguaO'Higgins Region, Chile
    1685.4×
  6. 6RengoO'Higgins Region, Chile
    1665.1×
  7. 7SantiagoSantiago Metropolitan, Chile
    1644.9×
  8. 8TalaganteSantiago Metropolitan, Chile
    1604.5×
  9. 9TalcaMaule Region, Chile
    1564.1×
  10. 10LinaresMaule Region, Chile
    1544.0×
  11. 11CauquenesMaule Region, Chile
    1544.0×
  12. 12San CarlosÑuble, Chile
    1533.9×
  13. 13ChillánÑuble, Chile
    1533.9×
  14. 14Puente AltoSantiago Metropolitan, Chile
    1533.8×
  15. 15TemucoAraucania, Chile
    1473.6×
  16. 16Los ÁngelesBiobio, Chile
    1473.6×
  17. 17BeijingBeijing, China
    1443.5×
  18. 18JakartaJakarta, Indonesia
    1403.4×
  19. 19Fort McMurrayAlberta, Canada
    1363.3×
  20. 20CuranilahueBiobio, Chile
    1353.3×
  21. 21Puerto AysénAysén, Chile
    1343.3×
  22. 22HanoiHanoi, Vietnam
    1283.1×
  23. 23KolkataWest Bengal, India
    1263.0×
  24. 24HyderabadTelangana, India
    1263.0×
  25. 25OsornoLos Lagos Region, Chile
    1243.0×
  26. 26Peshawarlow-cost sensorsKhyber Pakhtunkhwa, Pakistan
    1243.0×
  27. 27HualquiBiobio, Chile
    1202.9×
  28. 28Puerto VarasLos Lagos Region, Chile
    1162.8×
  29. 28HualpénBiobio, Chile
    1162.8×
  30. 30Lahorelow-cost sensorsPunjab, Pakistan
    1102.6×
  31. 31KigaliKigali, Rwanda
    1102.6×
  32. 31CoyhaiqueAysén, Chile
    1102.6×
  33. 33ChennaiTamil Nadu, India
    1012.4×
  34. 34Prince AlbertSaskatchewan, Canada
    1012.4×
  35. 35GuangzhouGuangdong, China
    982.3×
  36. 36ConcónValparaiso, Chile
    982.3×
  37. 37CoronelBiobio, Chile
    972.3×
  38. 38Viña del MarValparaiso, Chile
    962.2×
  39. 38CelayaGuanajuato, Mexico
    962.2×
  40. 40TalcahuanoBiobio, Chile
    942.1×
  41. 40QuinteroValparaiso, Chile
    942.1×
  42. 42QuillotaValparaiso, Chile
    922.1×
  43. 43BaghdadBaghdad, Iraq
    912.0×
  44. 44DelhiDelhi, India
    892.0×
  45. 45Kathmandulow-cost sensorsBagmati Province, Nepal
    892.0×
  46. 46CoquimboCoquimbo Region, Chile
    892.0×
  47. 46ChesterPennsylvania, United States
    892.0×
  48. 48JeddahMecca Region, Saudi Arabia
    881.9×
  49. 49ChiguayanteBiobio, Chile
    871.9×
  50. 50ShenyangLiaoning, China
    861.9×
  51. 51La UniónLos Ríos Region, Chile
    851.8×
  52. 51SalamancaGuanajuato, Mexico
    851.8×
  53. 53ValdiviaLos Ríos Region, Chile
    851.8×
  54. 54AntofagastaAntofagasta, Chile
    841.8×
  55. 54TexarkanaTexas, United States
    841.8×
  56. 56ToméBiobio, Chile
    841.8×
  57. 57La SerenaCoquimbo Region, Chile
    841.8×
  58. 57CopiapóAtacama, Chile
    841.8×
  59. 59AlbanyNew York, United States
    841.8×
  60. 60DurangoBasque Country, Spain
    831.8×
  61. 60NewarkDelaware, United States
    831.8×
  62. 62Puerto MonttLos Lagos Region, Chile
    831.8×
  63. 63SalorTashkent Region, Uzbekistan
    831.7×
  64. 64ConcepciónBiobio, Chile
    821.7×
  65. 65RabinalBaja Verapaz, Guatemala
    821.7×
  66. 65Guatemala CityGuatemala, Guatemala
    821.7×
  67. 65PhiladelphiaPennsylvania, United States
    821.7×
  68. 68Laudio / LlodioBasque Country, Spain
    811.7×
  69. 69BensalemPennsylvania, United States
    811.7×
  70. 70RuseRuse, Bulgaria
    801.7×
  71. 71Rose HillVirginia, United States
    801.6×
  72. 72PristinaPristina, Kosovo
    801.6×
  73. 73Mexico CityMexico City, Mexico
    791.6×
  74. 74San Pedro de la PazBiobio, Chile
    791.6×
  75. 75LotaBiobio, Chile
    791.6×
  76. 76Alto HospicioTarapacá, Chile
    771.6×
  77. 76Silao de la VictoriaGuanajuato, Mexico
    771.6×
  78. 78AthensAttica, Greece
    771.5×
  79. 79WilmingtonDelaware, United States
    771.5×
  80. 80Ecatepec de MorelosMéxico, Mexico
    771.5×
  81. 81OviedoAsturias, Spain
    771.5×
  82. 81BilbaoBasque Country, Spain
    771.5×
  83. 81ElktonMaryland, United States
    771.5×
  84. 84SpringfieldVirginia, United States
    761.5×
  85. 85DushanbeDushanbe, Tajikistan
    761.5×
  86. 85TocopillaAntofagasta, Chile
    761.5×
  87. 87AntananarivoAnalamanga, Madagascar
    751.5×
  88. 88BelmopanCayo District, Belize
    751.5×
  89. 89BakuBaki, Azerbaijan
    751.5×
  90. 90East HamptonVirginia, United States
    741.4×
  91. 91MelunÎle-de-France, France
    741.4×
  92. 92EdmontonAlberta, Canada
    741.4×
  93. 93Addis AbabaAddis Ababa, Ethiopia
    741.4×
  94. 94GuanajuatoGuanajuato, Mexico
    731.4×
  95. 94AbasoloGuanajuato, Mexico
    731.4×
  96. 96IrapuatoGuanajuato, Mexico
    731.4×
  97. 97SpringdaleArkansas, United States
    731.4×
  98. 97PennsaukenNew Jersey, United States
    731.4×
  99. 97BridgeportConnecticut, United States
    731.4×
  100. 100IndioCalifornia, United States
    721.4×
  101. 101ChesapeakeVirginia, United States
    711.3×
  102. 101NorristownPennsylvania, United States
    711.3×
  103. 103BangkokBangkok, Thailand
    711.3×
  104. 103Gasteiz / VitoriaBasque Country, Spain
    711.3×
  105. 103BarrieOntario, Canada
    711.3×
  106. 106Bang Bo DistrictSamut Prakan, Thailand
    711.3×
  107. 106Toms RiverNew Jersey, United States
    711.3×
  108. 106HamiltonOntario, Canada
    711.3×
  109. 109WashingtonDistrict of Columbia, United States
    701.3×
  110. 110BearDelaware, United States
    691.3×
  111. 111AricaArica y Parinacota Region, Chile
    691.3×
  112. 111RichmondVirginia, United States
    691.3×
  113. 113Bang KapiBangkok, Thailand
    691.2×
  114. 113SamaAsturias, Spain
    691.2×
  115. 113Ciudad JuárezChihuahua, Mexico
    691.2×
  116. 113HopewellVirginia, United States
    691.2×
  117. 117Nong KhaemBangkok, Thailand
    681.2×
  118. 117St. LouisMissouri, United States
    681.2×
  119. 117McAlesterOklahoma, United States
    681.2×
  120. 117YorkPennsylvania, United States
    681.2×
  121. 121Little RockArkansas, United States
    681.2×
  122. 122San Luis de la PazGuanajuato, Mexico
    681.2×
  123. 123Lincoln ParkMichigan, United States
    681.2×
  124. 123AllentownPennsylvania, United States
    681.2×
  125. 125CalamaAntofagasta, Chile
    671.2×
  126. 125LancasterPennsylvania, United States
    671.2×
  127. 127BethlehemPennsylvania, United States
    671.2×
  128. 128NitraNitra Region, Slovakia
    671.2×
  129. 129Phra PradaengSamut Prakan, Thailand
    671.2×
  130. 129GijónAsturias, Spain
    671.2×
  131. 131AcharnésAttica, Greece
    671.2×
  132. 131TrnavaTrnava Region, Slovakia
    671.2×
  133. 133A CoruñaGalicia, Spain
    661.2×
  134. 133KitchenerOntario, Canada
    661.2×
  135. 135NarónGalicia, Spain
    661.1×
  136. 135San Miguel de AllendeGuanajuato, Mexico
    661.1×
  137. 137SulphurLouisiana, United States
    661.1×
  138. 137MooreOklahoma, United States
    661.1×
  139. 137Red DeerAlberta, Canada
    661.1×
  140. 140Granite CityIllinois, United States
    661.1×
  141. 140BrantfordOntario, Canada
    661.1×
  142. 142Samut SakhonSamut Sakhon, Thailand
    651.1×
  143. 142BéthuneHauts-de-France, France
    651.1×
  144. 142CalgaryAlberta, Canada
    651.1×
  145. 145AsprópyrgosAttica, Greece
    651.1×
  146. 145ClevelandOhio, United States
    651.1×
  147. 145ReadingPennsylvania, United States
    651.1×
  148. 145HobbsNew Mexico, United States
    651.1×
  149. 149WolfsbergCarinthia, Austria
    651.1×
  150. 150SenicaTrnava Region, Slovakia
    641.1×
  151. 151YangonYangon, Myanmar
    641.1×
  152. 151HavířovMoravian-Silesian Region, Czechia
    641.1×
  153. 151BirminghamAlabama, United States
    641.1×
  154. 151SaskatoonSaskatchewan, Canada
    641.1×
  155. 155DieppeNormandy, France
    641.1×
  156. 155CharlottesvilleVirginia, United States
    641.1×
  157. 155TorontoOntario, Canada
    641.1×
  158. 158JenksOklahoma, United States
    641.1×
  159. 158LondonOntario, Canada
    641.1×
  160. 160BuffaloNew York, United States
    631.1×
  161. 161South LaurelMaryland, United States
    631.0×
  162. 162AlessandriaPiedmont, Italy
    631.0×
  163. 162LebanonPennsylvania, United States
    631.0×
  164. 164KhalándrionAttica, Greece
    631.0×
  165. 164Český TěšínMoravian-Silesian Region, Czechia
    631.0×
  166. 164Fort SmithArkansas, United States
    631.0×
  167. 164HarrisburgPennsylvania, United States
    631.0×
  168. 168CaenNormandy, France
    631.0×
  169. 168ScaggsvilleMaryland, United States
    631.0×
  170. 168PleasantvilleNew Jersey, United States
    631.0×
  171. 168KeeneNew Hampshire, United States
    631.0×
  172. 172RedfordMichigan, United States
    631.0×
  173. 172BellevilleOntario, Canada
    631.0×
  174. 172DorvalQuebec, Canada
    631.0×
  175. 172PeterboroughOntario, Canada
    631.0×
  176. 176AlbanyGeorgia, United States
    621.0×
  177. 177Frýdek-MístekMoravian-Silesian Region, Czechia
    621.0×
  178. 177ShreveportLouisiana, United States
    621.0×
  179. 177DetroitMichigan, United States
    621.0×
  180. 177CarlislePennsylvania, United States
    621.0×
  181. 177SaguenayQuebec, Canada
    621.0×
  182. 182Khlong LuangPathum Thani, Thailand
    621.0×
  183. 182Le HavreNormandy, France
    621.0×
  184. 182Donostia / San SebastiánBasque Country, Spain
    621.0×
  185. 182MontgomeryAlabama, United States
    621.0×
  186. 182GulfportMississippi, United States
    621.0×
  187. 182Port HuronMichigan, United States
    621.0×
  188. 182Greater SudburyOntario, Canada
    621.0×
  189. 189Saint-BrieucBrittany, France
    621.0×
  190. 189Baton RougeLouisiana, United States
    621.0×
  191. 189Hunt ValleyMaryland, United States
    621.0×
  192. 189TrentonNew Jersey, United States
    621.0×
  193. 193HueytownAlabama, United States
    621.0×
  194. 194BratislavaBratislava Region, Slovakia
    611.0×
  195. 194Ferry PassFlorida, United States
    611.0×
  196. 194JacksonMississippi, United States
    611.0×
  197. 194SarniaOntario, Canada
    611.0×
  198. 198WaterlooIowa, United States
    611.0×
  199. 198BurlingtonVermont, United States
    611.0×
  200. 200FerrolGalicia, Spain
    611.0×

Top 200 of 1,310 shown.

Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

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SmogRank, most polluted cities, PM2.5, May 31, 2023, smogrank.com/history/2023-05-31 (accessed 2 Oct 2026).

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